tests: gadget0: efm32hg: add gadget0 test for efm32hg

tests/gadget-zero/Makefile.efm32hg309-generic

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+##
+## This file is part of the libopencm3 project.
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BOARD = efm32hg309-generic
+PROJECT = usb-gadget0-$(BOARD)
+BUILD_DIR = bin-$(BOARD)
+
+SHARED_DIR = ../shared
+
+CFILES = main-$(BOARD).c
+CFILES += usb-gadget0.c
+CFILES += delay_efm32.c
+
+VPATH += $(SHARED_DIR)
+
+INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR))
+
+OPENCM3_DIR=../..
+
+### This section can go to an arch shared rules eventually...
+LDSCRIPT = ../../lib/efm32/hg/efm32hg309f64.ld
+OPENCM3_LIB = opencm3_efm32hg
+OPENCM3_DEFS = -DEFM32HG
+FP_FLAGS ?= -mfloat-abi=soft
+ARCH_FLAGS = -mthumb -mcpu=cortex-m0plus $(FP_FLAGS)
+#OOCD_INTERFACE = stlink-v2-1
+#OOCD_TARGET = efm32
+OOCD_FILE = openocd.efm32hg309-generic.cfg
+
+include ../rules.mk

tests/gadget-zero/delay_efm32.c

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2018 Seb Holzapfel <schnommus@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <libopencm3/efm32/cmu.h>
+#include <libopencm3/efm32/timer.h>
+
+#include "delay.h"
+
+extern const uint32_t ahb_frequency;
+
+void delay_setup(void)
+{
+	cmu_periph_clock_enable(CMU_TIMER2);
+	/* efm32hg doesn't support a nice 1us prescaler */
+	timer_start(TIMER2);
+}
+
+void delay_us(uint16_t us)
+{
+	volatile uint16_t time_now = 0;
+	/* Convert microseconds into timer ticks */
+	uint16_t delay_ahb_cycles = us * (ahb_frequency / 1000000);
+
+	TIMER2_CNT = 0;
+	while (time_now < delay_ahb_cycles) {
+		time_now = TIMER2_CNT;
+	}
+}

tests/gadget-zero/main-efm32hg309-generic.c

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2015 Karl Palsson <karlp@tweak.net.au>
+ * Copyright (C) 2018 Seb Holzapfel <schnommus@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/cm3/common.h>
+#include <libopencm3/cm3/vector.h>
+#include <libopencm3/cm3/scb.h>
+#include <libopencm3/cm3/nvic.h>
+
+#include <stdio.h>
+#include "usb-gadget0.h"
+
+/* no trace on cm0 #define ER_DEBUG */
+#ifdef ER_DEBUG
+#define ER_DPRINTF(fmt, ...) \
+	do { printf(fmt, ## __VA_ARGS__); } while (0)
+#else
+#define ER_DPRINTF(fmt, ...) \
+	do { } while (0)
+#endif
+
+const uint32_t ahb_frequency = 14000000;
+
+#include "trace.h"
+void trace_send_blocking8(int stimulus_port, char c)
+{
+	(void)stimulus_port;
+	(void)c;
+}
+
+int main(void)
+{
+	usbd_device *usbd_dev = gadget0_init(&efm32hg_usb_driver,
+			"efm32hg309-generic");
+
+	ER_DPRINTF("bootup complete\n");
+
+	while (1) {
+		gadget0_run(usbd_dev);
+	}
+}

tests/gadget-zero/openocd.efm32hg309-generic.cfg

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+# Generic efm32hg309 on Tomu board, using stm32l053-disco as debugger
+source [find interface/stlink-v2-1.cfg]
+transport select hla_swd
+adapter_khz 1000
+set CHIPNAME efm32hg309
+set CPUTAPID 0x0bc11477
+source [find target/efm32.cfg]
+
+source openocd.common.cfg
+optional_local "openocd.efm32hg309-generic.local.cfg"
+
+init
+targets
+reset halt